The three most disruptive transitions in history were the introduction of humans, farming, and industry. If another transition lies ahead, a good guess for its source is artificial intelligence in the form of whole brain emulations, or “ems,” sometime in the next century. I apply standard social science to this unusual situation, to identify a relatively-likely reference scenario set modestly far into a post-em-transition world. I consider families, reproduction, life plans, daily activities, inequality, work training, property rights, firm management, industrial organization, urban agglomeration, security, and governance.